Are you talking like doomsday or zombie apocalypse prepping? Hm... In addition to what others have said:
- a few solar powered calculators
- several walkie talkies and a way to power them
- wind up flashlights
- repair equipment (soldering iron, wire cutters, wire, etc)
Would a lead box shield those from an EMP? If so, then put those in a lead box in a basement or something